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Keywords: gypsum
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0299
... angles (25°,40°, 55°), two kinds of filling material(white cement, gypsum). The direct shear test is carried out under different normal stresses (30kN,50 kN,80 kN,120 kN). The results indicated that, when the normal stress is low, the peak shear strength of white cement filling and gypsum filling no...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0483
... gypsum rock was created through 3D printing with bassanite/gypsum. The 3D printing process enabled control of the orientation of the mineral texture within the printed layers. Three-point bending (3PB) experiments were performed on the 3D printed rock with a central notch. Unlike cast gypsum, the 3D...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-825
... formation of gypsum karst and oil reservoir acid stimulations. As an initial step to understand groundwater flow and dissolution in fractures and in wormholes, pipe flow is used as a simplified representation of groundwater flow. The extended Graetz solution was developed by Li and Einstein, 2017 to...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0573
... ABSTRACT: When anhydrite dissolves upon contact with water, the sulphate and calcium ions in the pore water can lead to precipitation of gypsum. This anhydrite to gypsum transformation (AGT) results in an increase in the solid volume by 61% and in a decrease or increase in the pore volume. On...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-675
... contact bond fails was used to investigate the cracking process of rocks containing single flaws and under uniaxial compression. The new contact model was first validated by using it to simulate the experimental cracking process of gypsum containing pre-existing single flaws at different inclination...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7528
... Abstract Gypsum (a mix of Hydrocal B-11 and Diatomaceous Earth) is used by the MIT rock mechanics group as a model rock material. Unconfined compression tests on pre-cracked specimens with high speed camera observation showed macro-cracking processes of gypsum similar to other materials...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-405
... Abstract: A series of laboratory experiments were performed on synthetic fractures in gypsum and lucite to study the ratio of shear to normal fracture specific stiffness of a single fracture subjected to normal and shear stress. The specimens were made by placing two blocks in contact to...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-296
... rupture, specimens containing artificial en-echelon flaws are studied in this paper. Rock-like material Hydrocal-BII gypsum is used to mould block specimens, which contain en-echelon flaws cut by the Waterjet. The fracturing processes of the specimens under uniaxial loading are observed and recorded by a...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-593
... strain fields around the flaw tip, relating the stress and strain fields to crack initiation and propagation, and comparing numerical results with those of tests performed on gypsum and marble specimens. Both stepped and coplanar flaw geometries were studied, as well as different stages of crack...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-049
... article. The foundation rocks comprise some limestones (Asamri Formation) and, to a greater extent, strata (Gachsaran Formation) containing marl, gypsum-bearing-marl, and gypsum. The lithomechanical characterization of the rocks included comprehensive engineering geology and rock mechanics studies...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-162
... framework (developed for Molded Gypsum and Carrara Marble) except for one new coalescence pattern. The crack initiation stress and the maximum stress were measured for each specimen, and these results are interpreted, also. 1. INTRODUCTION Crack coalescence, which is the linkage of pre-existing flaws, is...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-899
... ABSTRACT: The use of a high speed video system allows one to precisely observe the cracking mechanisms, in particular if shear or tensile fracturing is taking place. The present experimental study on gypsum and marble specimens confirmed that tensile wing cracks (TWCs) are in most cases the...
Proceedings Papers

Paper presented at the The 25th U.S. Symposium on Rock Mechanics (USRMS), June 25–27, 1984
Paper Number: ARMA-84-0328
... anhydrite (CaSO 4 ) and gypsum (CaSO 4 .2H 2 0) will be brought to the attention of researchers in rock mechanics. Hydration of anhydrite to gypsum may yield volume increases up to 62.6 percent and dehydration of gypsum to anhydrite may cause volume decreases up to 38.5 percent. If one were to convert the...
Proceedings Papers

Paper presented at the The 21st U.S. Symposium on Rock Mechanics (USRMS), May 27–30, 1980
Paper Number: ARMA-80-0498
... INTRODUCTION ABSTRACT Floor heave is a continuing problem in structures built upon black shale as a result of gypsum growth within the shales. This problem might be minimized by periodic injections of powerful crystallization inhibitor chemicals into the vicinity of potential gypsum growth...
Proceedings Papers

Paper presented at the 20th U.S. Symposium on Rock Mechanics (USRMS), June 4–6, 1979
Paper Number: ARMA-79-0075
... ABSTRACT ABSTRACT The use of rock mechanics techniques in the reappraisal of the mining dimensions of a gypsum mine as it was developed is described. The behaviour of the roof strata, under complex geological circumstances, was identified to be that of the "linear arch" structure...

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